blob: 48519887f94a021caa2e91e9287ad1db491e9c29 [file] [log] [blame]
/*
* libata-core.c - helper library for ATA
*
* Maintained by: Jeff Garzik <jgarzik@pobox.com>
* Please ALWAYS copy linux-ide@vger.kernel.org
* on emails.
*
* Copyright 2003-2004 Red Hat, Inc. All rights reserved.
* Copyright 2003-2004 Jeff Garzik
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* libata documentation is available via 'make {ps|pdf}docs',
* as Documentation/DocBook/libata.*
*
* Hardware documentation available from http://www.t13.org/ and
* http://www.sata-io.org/
*
* Standards documents from:
* http://www.t13.org (ATA standards, PCI DMA IDE spec)
* http://www.t10.org (SCSI MMC - for ATAPI MMC)
* http://www.sata-io.org (SATA)
* http://www.compactflash.org (CF)
* http://www.qic.org (QIC157 - Tape and DSC)
* http://www.ce-ata.org (CE-ATA: not supported)
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
#include <linux/jiffies.h>
#include <linux/scatterlist.h>
#include <linux/io.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>
#include <linux/cdrom.h>
#include "libata.h"
/* debounce timing parameters in msecs { interval, duration, timeout } */
const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
static unsigned int ata_dev_init_params(struct ata_device *dev,
u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
static unsigned int ata_dev_set_feature(struct ata_device *dev,
u8 enable, u8 feature);
static void ata_dev_xfermask(struct ata_device *dev);
static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
unsigned int ata_print_id = 1;
static struct workqueue_struct *ata_wq;
struct workqueue_struct *ata_aux_wq;
struct ata_force_param {
const char *name;
unsigned int cbl;
int spd_limit;
unsigned long xfer_mask;
unsigned int horkage_on;
unsigned int horkage_off;
};
struct ata_force_ent {
int port;
int device;
struct ata_force_param param;
};
static struct ata_force_ent *ata_force_tbl;
static int ata_force_tbl_size;
static char ata_force_param_buf[PAGE_SIZE] __initdata;
/* param_buf is thrown away after initialization, disallow read */
module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");
int atapi_enabled = 1;
module_param(atapi_enabled, int, 0444);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
static int atapi_dmadir = 0;
module_param(atapi_dmadir, int, 0444);
MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
int atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
static int ata_ignore_hpa;
module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
module_param_named(dma, libata_dma_mask, int, 0444);
MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
module_param(ata_probe_timeout, int, 0444);
MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
int libata_noacpi = 0;
module_param_named(noacpi, libata_noacpi, int, 0444);
MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
int libata_allow_tpm = 0;
module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");
MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
/**
* ata_force_cbl - force cable type according to libata.force
* @ap: ATA port of interest
*
* Force cable type according to libata.force and whine about it.
* The last entry which has matching port number is used, so it
* can be specified as part of device force parameters. For
* example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
* same effect.
*
* LOCKING:
* EH context.
*/
void ata_force_cbl(struct ata_port *ap)
{
int i;
for (i = ata_force_tbl_size - 1; i >= 0; i--) {
const struct ata_force_ent *fe = &ata_force_tbl[i];
if (fe->port != -1 && fe->port != ap->print_id)
continue;
if (fe->param.cbl == ATA_CBL_NONE)
continue;
ap->cbl = fe->param.cbl;
ata_port_printk(ap, KERN_NOTICE,
"FORCE: cable set to %s\n", fe->param.name);
return;
}
}
/**
* ata_force_spd_limit - force SATA spd limit according to libata.force
* @link: ATA link of interest
*
* Force SATA spd limit according to libata.force and whine about
* it. When only the port part is specified (e.g. 1:), the limit
* applies to all links connected to both the host link and all
* fan-out ports connected via PMP. If the device part is
* specified as 0 (e.g. 1.00:), it specifies the first fan-out
* link not the host link. Device number 15 always points to the
* host link whether PMP is attached or not.
*
* LOCKING:
* EH context.
*/
static void ata_force_spd_limit(struct ata_link *link)
{
int linkno, i;
if (ata_is_host_link(link))
linkno = 15;
else
linkno = link->pmp;
for (i = ata_force_tbl_size - 1; i >= 0; i--) {
const struct ata_force_ent *fe = &ata_force_tbl[i];
if (fe->port != -1 && fe->port != link->ap->print_id)
continue;
if (fe->device != -1 && fe->device != linkno)
continue;
if (!fe->param.spd_limit)
continue;
link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
ata_link_printk(link, KERN_NOTICE,
"FORCE: PHY spd limit set to %s\n", fe->param.name);
return;
}
}
/**
* ata_force_xfermask - force xfermask according to libata.force
* @dev: ATA device of interest
*
* Force xfer_mask according to libata.force and whine about it.
* For consistency with link selection, device number 15 selects
* the first device connected to the host link.
*
* LOCKING:
* EH context.
*/
static void ata_force_xfermask(struct ata_device *dev)
{
int devno = dev->link->pmp + dev->devno;
int alt_devno = devno;
int i;
/* allow n.15 for the first device attached to host port */
if (ata_is_host_link(dev->link) && devno == 0)
alt_devno = 15;
for (i = ata_force_tbl_size - 1; i >= 0; i--) {
const struct ata_force_ent *fe = &ata_force_tbl[i];
unsigned long pio_mask, mwdma_mask, udma_mask;
if (fe->port != -1 && fe->port != dev->link->ap->print_id)
continue;
if (fe->device != -1 && fe->device != devno &&
fe->device != alt_devno)
continue;
if (!fe->param.xfer_mask)
continue;
ata_unpack_xfermask(fe->param.xfer_mask,
&pio_mask, &mwdma_mask, &udma_mask);
if (udma_mask)
dev->udma_mask = udma_mask;
else if (mwdma_mask) {
dev->udma_mask = 0;
dev->mwdma_mask = mwdma_mask;
} else {
dev->udma_mask = 0;
dev->mwdma_mask = 0;
dev->pio_mask = pio_mask;
}
ata_dev_printk(dev, KERN_NOTICE,
"FORCE: xfer_mask set to %s\n", fe->param.name);
return;
}
}
/**
* ata_force_horkage - force horkage according to libata.force
* @dev: ATA device of interest
*
* Force horkage according to libata.force and whine about it.
* For consistency with link selection, device number 15 selects
* the first device connected to the host link.
*
* LOCKING:
* EH context.
*/
static void ata_force_horkage(struct ata_device *dev)
{
int devno = dev->link->pmp + dev->devno;
int alt_devno = devno;
int i;
/* allow n.15 for the first device attached to host port */
if (ata_is_host_link(dev->link) && devno == 0)
alt_devno = 15;
for (i = 0; i < ata_force_tbl_size; i++) {
const struct ata_force_ent *fe = &ata_force_tbl[i];
if (fe->port != -1 && fe->port != dev->link->ap->print_id)
continue;
if (fe->device != -1 && fe->device != devno &&
fe->device != alt_devno)
continue;
if (!(~dev->horkage & fe->param.horkage_on) &&
!(dev->horkage & fe->param.horkage_off))
continue;
dev->horkage |= fe->param.horkage_on;
dev->horkage &= ~fe->param.horkage_off;
ata_dev_printk(dev, KERN_NOTICE,
"FORCE: horkage modified (%s)\n", fe->param.name);
}
}
/**
* ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
* @tf: Taskfile to convert
* @pmp: Port multiplier port
* @is_cmd: This FIS is for command
* @fis: Buffer into which data will output
*
* Converts a standard ATA taskfile to a Serial ATA
* FIS structure (Register - Host to Device).
*
* LOCKING:
* Inherited from caller.
*/
void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
{
fis[0] = 0x27; /* Register - Host to Device FIS */
fis[1] = pmp & 0xf; /* Port multiplier number*/
if (is_cmd)
fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
fis[2] = tf->command;
fis[3] = tf->feature;
fis[4] = tf->lbal;
fis[5] = tf->lbam;
fis[6] = tf->lbah;
fis[7] = tf->device;
fis[8] = tf->hob_lbal;
fis[9] = tf->hob_lbam;
fis[10] = tf->hob_lbah;
fis[11] = tf->hob_feature;
fis[12] = tf->nsect;
fis[13] = tf->hob_nsect;
fis[14] = 0;
fis[15] = tf->ctl;
fis[16] = 0;
fis[17] = 0;
fis[18] = 0;
fis[19] = 0;
}
/**
* ata_tf_from_fis - Convert SATA FIS to ATA taskfile
* @fis: Buffer from which data will be input
* @tf: Taskfile to output
*
* Converts a serial ATA FIS structure to a standard ATA taskfile.
*
* LOCKING:
* Inherited from caller.
*/
void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
{
tf->command = fis[2]; /* status */
tf->feature = fis[3]; /* error */
tf->lbal = fis[4];
tf->lbam = fis[5];
tf->lbah = fis[6];
tf->device = fis[7];
tf->hob_lbal = fis[8];
tf->hob_lbam = fis[9];
tf->hob_lbah = fis[10];
tf->nsect = fis[12];
tf->hob_nsect = fis[13];
}
static const u8 ata_rw_cmds[] = {
/* pio multi */
ATA_CMD_READ_MULTI,
ATA_CMD_WRITE_MULTI,
ATA_CMD_READ_MULTI_EXT,
ATA_CMD_WRITE_MULTI_EXT,
0,
0,
0,
ATA_CMD_WRITE_MULTI_FUA_EXT,
/* pio */
ATA_CMD_PIO_READ,
ATA_CMD_PIO_WRITE,
ATA_CMD_PIO_READ_EXT,
ATA_CMD_PIO_WRITE_EXT,
0,
0,
0,
0,
/* dma */
ATA_CMD_READ,
ATA_CMD_WRITE,
ATA_CMD_READ_EXT,
ATA_CMD_WRITE_EXT,
0,
0,
0,
ATA_CMD_WRITE_FUA_EXT
};
/**
* ata_rwcmd_protocol - set taskfile r/w commands and protocol
* @tf: command to examine and configure
* @dev: device tf belongs to
*
* Examine the device configuration and tf->flags to calculate
* the proper read/write commands and protocol to use.
*
* LOCKING:
* caller.
*/
static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
{
u8 cmd;
int index, fua, lba48, write;
fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
if (dev->flags & ATA_DFLAG_PIO) {
tf->protocol = ATA_PROT_PIO;
index = dev->multi_count ? 0 : 8;
} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
/* Unable to use DMA due to host limitation */
tf->protocol = ATA_PROT_PIO;
index = dev->multi_count ? 0 : 8;
} else {
tf->protocol = ATA_PROT_DMA;
index = 16;
}
cmd = ata_rw_cmds[index + fua + lba48 + write];
if (cmd) {
tf->command = cmd;
return 0;
}
return -1;
}
/**
* ata_tf_read_block - Read block address from ATA taskfile
* @tf: ATA taskfile of interest
* @dev: ATA device @tf belongs to
*
* LOCKING:
* None.
*
* Read block address from @tf. This function can handle all
* three address formats - LBA, LBA48 and CHS. tf->protocol and
* flags select the address format to use.
*
* RETURNS:
* Block address read from @tf.
*/
u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
{
u64 block = 0;
if (tf->flags & ATA_TFLAG_LBA) {
if (tf->flags & ATA_TFLAG_LBA48) {
block |= (u64)tf->hob_lbah << 40;
block |= (u64)tf->hob_lbam << 32;
block |= tf->hob_lbal << 24;
} else
block |= (tf->device & 0xf) << 24;
block |= tf->lbah << 16;
block |= tf->lbam << 8;
block |= tf->lbal;
} else {
u32 cyl, head, sect;
cyl = tf->lbam | (tf->lbah << 8);
head = tf->device & 0xf;
sect = tf->lbal;
block = (cyl * dev->heads + head) * dev->sectors + sect;
}
return block;
}
/**
* ata_build_rw_tf - Build ATA taskfile for given read/write request
* @tf: Target ATA taskfile
* @dev: ATA device @tf belongs to
* @block: Block address
* @n_block: Number of blocks
* @tf_flags: RW/FUA etc...
* @tag: tag
*
* LOCKING:
* None.
*
* Build ATA taskfile @tf for read/write request described by
* @block, @n_block, @tf_flags and @tag on @dev.
*
* RETURNS:
*
* 0 on success, -ERANGE if the request is too large for @dev,
* -EINVAL if the request is invalid.
*/
int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
u64 block, u32 n_block, unsigned int tf_flags,
unsigned int tag)
{
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->flags |= tf_flags;
if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
/* yay, NCQ */
if (!lba_48_ok(block, n_block))
return -ERANGE;
tf->protocol = ATA_PROT_NCQ;
tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
if (tf->flags & ATA_TFLAG_WRITE)
tf->command = ATA_CMD_FPDMA_WRITE;
else
tf->command = ATA_CMD_FPDMA_READ;
tf->nsect = tag << 3;
tf->hob_feature = (n_block >> 8) & 0xff;
tf->feature = n_block & 0xff;
tf->hob_lbah = (block >> 40) & 0xff;
tf->hob_lbam = (block >> 32) & 0xff;
tf->hob_lbal = (block >> 24) & 0xff;
tf->lbah = (block >> 16) & 0xff;
tf->lbam = (block >> 8) & 0xff;
tf->lbal = block & 0xff;
tf->device = 1 << 6;
if (tf->flags & ATA_TFLAG_FUA)
tf->device |= 1 << 7;
} else if (dev->flags & ATA_DFLAG_LBA) {
tf->flags |= ATA_TFLAG_LBA;
if (lba_28_ok(block, n_block)) {
/* use LBA28 */
tf->device |= (block >> 24) & 0xf;
} else if (lba_48_ok(block, n_block)) {
if (!(dev->flags & ATA_DFLAG_LBA48))
return -ERANGE;
/* use LBA48 */
tf->flags |= ATA_TFLAG_LBA48;
tf->hob_nsect = (n_block >> 8) & 0xff;
tf->hob_lbah = (block >> 40) & 0xff;
tf->hob_lbam = (block >> 32) & 0xff;
tf->hob_lbal = (block >> 24) & 0xff;
} else
/* request too large even for LBA48 */
return -ERANGE;
if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
return -EINVAL;
tf->nsect = n_block & 0xff;
tf->lbah = (block >> 16) & 0xff;
tf->lbam = (block >> 8) & 0xff;
tf->lbal = block & 0xff;
tf->device |= ATA_LBA;
} else {
/* CHS */
u32 sect, head, cyl, track;
/* The request -may- be too large for CHS addressing. */
if (!lba_28_ok(block, n_block))
return -ERANGE;
if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
return -EINVAL;
/* Convert LBA to CHS */
track = (u32)block / dev->sectors;
cyl = track / dev->heads;
head = track % dev->heads;
sect = (u32)block % dev->sectors + 1;
DPRINTK("block %u track %u cyl %u head %u sect %u\n",
(u32)block, track, cyl, head, sect);
/* Check whether the converted CHS can fit.
Cylinder: 0-65535
Head: 0-15
Sector: 1-255*/
if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
return -ERANGE;
tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
tf->lbal = sect;
tf->lbam = cyl;
tf->lbah = cyl >> 8;
tf->device |= head;
}
return 0;
}
/**
* ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
* @pio_mask: pio_mask
* @mwdma_mask: mwdma_mask
* @udma_mask: udma_mask
*
* Pack @pio_mask, @mwdma_mask and @udma_mask into a single
* unsigned int xfer_mask.
*
* LOCKING:
* None.
*
* RETURNS:
* Packed xfer_mask.
*/
unsigned long ata_pack_xfermask(unsigned long pio_mask,
unsigned long mwdma_mask,
unsigned long udma_mask)
{
return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
}
/**
* ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
* @xfer_mask: xfer_mask to unpack
* @pio_mask: resulting pio_mask
* @mwdma_mask: resulting mwdma_mask
* @udma_mask: resulting udma_mask
*
* Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
* Any NULL distination masks will be ignored.
*/
void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
unsigned long *mwdma_mask, unsigned long *udma_mask)
{
if (pio_mask)
*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
if (mwdma_mask)
*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
if (udma_mask)
*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
}
static const struct ata_xfer_ent {
int shift, bits;
u8 base;
} ata_xfer_tbl[] = {
{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
{ -1, },
};
/**
* ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
* @xfer_mask: xfer_mask of interest
*
* Return matching XFER_* value for @xfer_mask. Only the highest
* bit of @xfer_mask is considered.
*
* LOCKING:
* None.
*
* RETURNS:
* Matching XFER_* value, 0xff if no match found.
*/
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
{
int highbit = fls(xfer_mask) - 1;
const struct ata_xfer_ent *ent;
for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
return ent->base + highbit - ent->shift;
return 0xff;
}
/**
* ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
* @xfer_mode: XFER_* of interest
*
* Return matching xfer_mask for @xfer_mode.
*
* LOCKING:
* None.
*
* RETURNS:
* Matching xfer_mask, 0 if no match found.
*/
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
{
const struct ata_xfer_ent *ent;
for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
& ~((1 << ent->shift) - 1);
return 0;
}
/**
* ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
* @xfer_mode: XFER_* of interest
*
* Return matching xfer_shift for @xfer_mode.
*
* LOCKING:
* None.
*
* RETURNS:
* Matching xfer_shift, -1 if no match found.
*/
int ata_xfer_mode2shift(unsigned long xfer_mode)
{
const struct ata_xfer_ent *ent;
for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
return ent->shift;
return -1;
}
/**
* ata_mode_string - convert xfer_mask to string
* @xfer_mask: mask of bits supported; only highest bit counts.
*
* Determine string which represents the highest speed
* (highest bit in @modemask).
*
* LOCKING:
* None.
*
* RETURNS:
* Constant C string representing highest speed listed in
* @mode_mask, or the constant C string "<n/a>".
*/
const char *ata_mode_string(unsigned long xfer_mask)
{
static const char * const xfer_mode_str[] = {
"PIO0",
"PIO1",
"PIO2",
"PIO3",
"PIO4",
"PIO5",
"PIO6",
"MWDMA0",
"MWDMA1",
"MWDMA2",
"MWDMA3",
"MWDMA4",
"UDMA/16",
"UDMA/25",
"UDMA/33",
"UDMA/44",
"UDMA/66",
"UDMA/100",
"UDMA/133",
"UDMA7",
};
int highbit;
highbit = fls(xfer_mask) - 1;
if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
return xfer_mode_str[highbit];
return "<n/a>";
}
static const char *sata_spd_string(unsigned int spd)
{
static const char * const spd_str[] = {
"1.5 Gbps",
"3.0 Gbps",
};
if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
return "<unknown>";
return spd_str[spd - 1];
}
void ata_dev_disable(struct ata_device *dev)
{
if (ata_dev_enabled(dev)) {
if (ata_msg_drv(dev->link->ap))
ata_dev_printk(dev, KERN_WARNING, "disabled\n");
ata_acpi_on_disable(dev);
ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
ATA_DNXFER_QUIET);
dev->class++;
}
}
static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
u32 scontrol;
unsigned int err_mask;
int rc;
/*
* disallow DIPM for drivers which haven't set
* ATA_FLAG_IPM. This is because when DIPM is enabled,
* phy ready will be set in the interrupt status on
* state changes, which will cause some drivers to
* think there are errors - additionally drivers will
* need to disable hot plug.
*/
if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
ap->pm_policy = NOT_AVAILABLE;
return -EINVAL;
}
/*
* For DIPM, we will only enable it for the
* min_power setting.
*
* Why? Because Disks are too stupid to know that
* If the host rejects a request to go to SLUMBER
* they should retry at PARTIAL, and instead it
* just would give up. So, for medium_power to
* work at all, we need to only allow HIPM.
*/
rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
if (rc)
return rc;
switch (policy) {
case MIN_POWER:
/* no restrictions on IPM transitions */
scontrol &= ~(0x3 << 8);
rc = sata_scr_write(link, SCR_CONTROL, scontrol);
if (rc)
return rc;
/* enable DIPM */
if (dev->flags & ATA_DFLAG_DIPM)
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_ENABLE, SATA_DIPM);
break;
case MEDIUM_POWER:
/* allow IPM to PARTIAL */
scontrol &= ~(0x1 << 8);
scontrol |= (0x2 << 8);
rc = sata_scr_write(link, SCR_CONTROL, scontrol);
if (rc)
return rc;
/*
* we don't have to disable DIPM since IPM flags
* disallow transitions to SLUMBER, which effectively
* disable DIPM if it does not support PARTIAL
*/
break;
case NOT_AVAILABLE:
case MAX_PERFORMANCE:
/* disable all IPM transitions */
scontrol |= (0x3 << 8);
rc = sata_scr_write(link, SCR_CONTROL, scontrol);
if (rc)
return rc;
/*
* we don't have to disable DIPM since IPM flags
* disallow all transitions which effectively
* disable DIPM anyway.
*/
break;
}
/* FIXME: handle SET FEATURES failure */
(void) err_mask;
return 0;
}
/**
* ata_dev_enable_pm - enable SATA interface power management
* @dev: device to enable power management
* @policy: the link power management policy
*
* Enable SATA Interface power management. This will enable
* Device Interface Power Management (DIPM) for min_power
* policy, and then call driver specific callbacks for
* enabling Host Initiated Power management.
*
* Locking: Caller.
* Returns: -EINVAL if IPM is not supported, 0 otherwise.
*/
void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
{
int rc = 0;
struct ata_port *ap = dev->link->ap;
/* set HIPM first, then DIPM */
if (ap->ops->enable_pm)
rc = ap->ops->enable_pm(ap, policy);
if (rc)
goto enable_pm_out;
rc = ata_dev_set_dipm(dev, policy);
enable_pm_out:
if (rc)
ap->pm_policy = MAX_PERFORMANCE;
else
ap->pm_policy = policy;
return /* rc */; /* hopefully we can use 'rc' eventually */
}
#ifdef CONFIG_PM
/**
* ata_dev_disable_pm - disable SATA interface power management
* @dev: device to disable power management
*
* Disable SATA Interface power management. This will disable
* Device Interface Power Management (DIPM) without changing
* policy, call driver specific callbacks for disabling Host
* Initiated Power management.
*
* Locking: Caller.
* Returns: void
*/
static void ata_dev_disable_pm(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
ata_dev_set_dipm(dev, MAX_PERFORMANCE);
if (ap->ops->disable_pm)
ap->ops->disable_pm(ap);
}
#endif /* CONFIG_PM */
void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
ap->pm_policy = policy;
ap->link.eh_info.action |= ATA_EH_LPM;
ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
ata_port_schedule_eh(ap);
}
#ifdef CONFIG_PM
static void ata_lpm_enable(struct ata_host *host)
{
struct ata_link *link;
struct ata_port *ap;
struct ata_device *dev;
int i;
for (i = 0; i < host->n_ports; i++) {
ap = host->ports[i];
ata_port_for_each_link(link, ap) {
ata_link_for_each_dev(dev, link)
ata_dev_disable_pm(dev);
}
}
}
static void ata_lpm_disable(struct ata_host *host)
{
int i;
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
ata_lpm_schedule(ap, ap->pm_policy);
}
}
#endif /* CONFIG_PM */
/**
* ata_devchk - PATA device presence detection
* @ap: ATA channel to examine
* @device: Device to examine (starting at zero)
*
* This technique was originally described in
* Hale Landis's ATADRVR (www.ata-atapi.com), and
* later found its way into the ATA/ATAPI spec.
*
* Write a pattern to the ATA shadow registers,
* and if a device is present, it will respond by
* correctly storing and echoing back the
* ATA shadow register contents.
*
* LOCKING:
* caller.
*/
static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
u8 nsect, lbal;
ap->ops->dev_select(ap, device);
iowrite8(0x55, ioaddr->nsect_addr);
iowrite8(0xaa, ioaddr->lbal_addr);
iowrite8(0xaa, ioaddr->nsect_addr);
iowrite8(0x55, ioaddr->lbal_addr);
iowrite8(0x55, ioaddr->nsect_addr);
iowrite8(0xaa, ioaddr->lbal_addr);
nsect = ioread8(ioaddr->nsect_addr);
lbal = ioread8(ioaddr->lbal_addr);
if ((nsect == 0x55) && (lbal == 0xaa))
return 1; /* we found a device */
return 0; /* nothing found */
}
/**
* ata_dev_classify - determine device type based on ATA-spec signature
* @tf: ATA taskfile register set for device to be identified
*
* Determine from taskfile register contents whether a device is
* ATA or ATAPI, as per "Signature and persistence" section
* of ATA/PI spec (volume 1, sect 5.14).
*
* LOCKING:
* None.
*
* RETURNS:
* Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
* %ATA_DEV_UNKNOWN the event of failure.
*/
unsigned int ata_dev_classify(const struct ata_taskfile *tf)
{
/* Apple's open source Darwin code hints that some devices only
* put a proper signature into the LBA mid/high registers,
* So, we only check those. It's sufficient for uniqueness.
*
* ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
* signatures for ATA and ATAPI devices attached on SerialATA,
* 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
* spec has never mentioned about using different signatures
* for ATA/ATAPI devices. Then, Serial ATA II: Port
* Multiplier specification began to use 0x69/0x96 to identify
* port multpliers and 0x3c/0xc3 to identify SEMB device.
* ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
* 0x69/0x96 shortly and described them as reserved for
* SerialATA.
*
* We follow the current spec and consider that 0x69/0x96
* identifies a port multiplier and 0x3c/0xc3 a SEMB device.
*/
if ((tf->lbam == 0) && (tf->lbah == 0)) {
DPRINTK("found ATA device by sig\n");
return ATA_DEV_ATA;
}
if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
DPRINTK("found ATAPI device by sig\n");
return ATA_DEV_ATAPI;
}
if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
DPRINTK("found PMP device by sig\n");
return ATA_DEV_PMP;
}
if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
printk(KERN_INFO "ata: SEMB device ignored\n");
return ATA_DEV_SEMB_UNSUP; /* not yet */
}
DPRINTK("unknown device\n");
return ATA_DEV_UNKNOWN;
}
/**
* ata_dev_try_classify - Parse returned ATA device signature
* @dev: ATA device to classify (starting at zero)
* @present: device seems present
* @r_err: Value of error register on completion
*
* After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
* an ATA/ATAPI-defined set of values is placed in the ATA
* shadow registers, indicating the results of device detection
* and diagnostics.
*
* Select the ATA device, and read the values from the ATA shadow
* registers. Then parse according to the Error register value,
* and the spec-defined values examined by ata_dev_classify().
*
* LOCKING:
* caller.
*
* RETURNS:
* Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
*/
unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
u8 *r_err)
{
struct ata_port *ap = dev->link->ap;
struct ata_taskfile tf;
unsigned int class;
u8 err;
ap->ops->dev_select(ap, dev->devno);
memset(&tf, 0, sizeof(tf));
ap->ops->tf_read(ap, &tf);
err = tf.feature;
if (r_err)
*r_err = err;
/* see if device passed diags: continue and warn later */
if (err == 0)
/* diagnostic fail : do nothing _YET_ */
dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
else if (err == 1)
/* do nothing */ ;
else if ((dev->devno == 0) && (err == 0x81))
/* do nothing */ ;
else
return ATA_DEV_NONE;
/* determine if device is ATA or ATAPI */
class = ata_dev_classify(&tf);
if (class == ATA_DEV_UNKNOWN) {
/* If the device failed diagnostic, it's likely to
* have reported incorrect device signature too.
* Assume ATA device if the device seems present but
* device signature is invalid with diagnostic
* failure.
*/
if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC))
class = ATA_DEV_ATA;
else
class = ATA_DEV_NONE;
} else if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
class = ATA_DEV_NONE;
return class;
}
/**
* ata_id_string - Convert IDENTIFY DEVICE page into string
* @id: IDENTIFY DEVICE results we will examine
* @s: string into which data is output
* @ofs: offset into identify device page
* @len: length of string to return. must be an even number.
*
* The strings in the IDENTIFY DEVICE page are broken up into
* 16-bit chunks. Run through the string, and output each
* 8-bit chunk linearly, regardless of platform.
*
* LOCKING:
* caller.
*/
void ata_id_string(const u16 *id, unsigned char *s,
unsigned int ofs, unsigned int len)
{
unsigned int c;
while (len > 0) {
c = id[ofs] >> 8;
*s = c;
s++;
c = id[ofs] & 0xff;
*s = c;
s++;
ofs++;
len -= 2;
}
}
/**
* ata_id_c_string - Convert IDENTIFY DEVICE page into C string
* @id: IDENTIFY DEVICE results we will examine
* @s: string into which data is output
* @ofs: offset into identify device page
* @len: length of string to return. must be an odd number.
*
* This function is identical to ata_id_string except that it
* trims trailing spaces and terminates the resulting string with
* null. @len must be actual maximum length (even number) + 1.
*
* LOCKING:
* caller.
*/
void ata_id_c_string(const u16 *id, unsigned char *s,
unsigned int ofs, unsigned int len)
{
unsigned char *p;
WARN_ON(!(len & 1));
ata_id_string(id, s, ofs, len - 1);
p = s + strnlen(s, len - 1);
while (p > s && p[-1] == ' ')
p--;
*p = '\0';
}
static u64 ata_id_n_sectors(const u16 *id)
{
if (ata_id_has_lba(id)) {
if (ata_id_has_lba48(id))
return ata_id_u64(id, 100);
else
return ata_id_u32(id, 60);
} else {
if (ata_id_current_chs_valid(id))
return ata_id_u32(id, 57);
else
return id[1] * id[3] * id[6];
}
}
static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
{
u64 sectors = 0;
sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
sectors |= (tf->hob_lbal & 0xff) << 24;
sectors |= (tf->lbah & 0xff) << 16;
sectors |= (tf->lbam & 0xff) << 8;
sectors |= (tf->lbal & 0xff);
return ++sectors;
}
static u64 ata_tf_to_lba(struct ata_taskfile *tf)
{
u64 sectors = 0;
sectors |= (tf->device & 0x0f) << 24;
sectors |= (tf->lbah & 0xff) << 16;
sectors |= (tf->lbam & 0xff) << 8;
sectors |= (tf->lbal & 0xff);
return ++sectors;
}
/**
* ata_read_native_max_address - Read native max address
* @dev: target device
* @max_sectors: out parameter for the result native max address
*
* Perform an LBA48 or LBA28 native size query upon the device in
* question.
*
* RETURNS:
* 0 on success, -EACCES if command is aborted by the drive.
* -EIO on other errors.
*/
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
{
unsigned int err_mask;
struct ata_taskfile tf;
int lba48 = ata_id_has_lba48(dev->id);
ata_tf_init(dev, &tf);
/* always clear all address registers */
tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
if (lba48) {
tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
tf.flags |= ATA_TFLAG_LBA48;
} else
tf.command = ATA_CMD_READ_NATIVE_MAX;
tf.protocol |= ATA_PROT_NODATA;
tf.device |= ATA_LBA;
err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
if (err_mask) {
ata_dev_printk(dev, KERN_WARNING, "failed to read native "
"max address (err_mask=0x%x)\n", err_mask);
if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
return -EACCES;
return -EIO;
}
if (lba48)
*max_sectors = ata_tf_to_lba48(&tf);
else
*max_sectors = ata_tf_to_lba(&tf);
if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
(*max_sectors)--;
return 0;
}
/**
* ata_set_max_sectors - Set max sectors
* @dev: target device
* @new_sectors: new max sectors value to set for the device
*
* Set max sectors of @dev to @new_sectors.
*
* RETURNS:
* 0 on success, -EACCES if command is aborted or denied (due to
* previous non-volatile SET_MAX) by the drive. -EIO on other
* errors.
*/
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
{
unsigned int err_mask;
struct ata_taskfile tf;
int lba48 = ata_id_has_lba48(dev->id);
new_sectors--;
ata_tf_init(dev, &tf);
tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
if (lba48) {
tf.command = ATA_CMD_SET_MAX_EXT;
tf.flags |= ATA_TFLAG_LBA48;
tf.hob_lbal = (new_sectors >> 24) & 0xff;
tf.hob_lbam = (new_sectors >> 32) & 0xff;
tf.hob_lbah = (new_sectors >> 40) & 0xff;
} else {
tf.command = ATA_CMD_SET_MAX;
tf.device |= (new_sectors >> 24) & 0xf;
}
tf.protocol |= ATA_PROT_NODATA;
tf.device |= ATA_LBA;
tf.lbal = (new_sectors >> 0) & 0xff;
tf.lbam = (new_sectors >> 8) & 0xff;
tf.lbah = (new_sectors >> 16) & 0xff;
err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
if (err_mask) {
ata_dev_printk(dev, KERN_WARNING, "failed to set "
"max address (err_mask=0x%x)\n", err_mask);
if (err_mask == AC_ERR_DEV &&
(tf.feature & (ATA_ABORTED | ATA_IDNF)))
return -EACCES;
return -EIO;
}
return 0;
}
/**
* ata_hpa_resize - Resize a device with an HPA set
* @dev: Device to resize
*
* Read the size of an LBA28 or LBA48 disk with HPA features and resize
* it if required to the full size of the media. The caller must check
* the drive has the HPA feature set enabled.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int ata_hpa_resize(struct ata_device *dev)
{
struct ata_eh_context *ehc = &dev->link->eh_context;
int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
u64 sectors = ata_id_n_sectors(dev->id);
u64 native_sectors;
int rc;
/* do we need to do it? */
if (dev->class != ATA_DEV_ATA ||
!ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
(dev->horkage & ATA_HORKAGE_BROKEN_HPA))
return 0;
/* read native max address */
rc = ata_read_native_max_address(dev, &native_sectors);
if (rc) {
/* If device aborted the command or HPA isn't going to
* be unlocked, skip HPA resizing.
*/
if (rc == -EACCES || !ata_ignore_hpa) {
ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
"broken, skipping HPA handling\n");
dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
/* we can continue if device aborted the command */
if (rc == -EACCES)
rc = 0;
}
return rc;
}
/* nothing to do? */
if (native_sectors <= sectors || !ata_ignore_hpa) {
if (!print_info || native_sectors == sectors)
return 0;
if (native_sectors > sectors)
ata_dev_printk(dev, KERN_INFO,
"HPA detected: current %llu, native %llu\n",
(unsigned long long)sectors,
(unsigned long long)native_sectors);
else if (native_sectors < sectors)
ata_dev_printk(dev, KERN_WARNING,
"native sectors (%llu) is smaller than "
"sectors (%llu)\n",
(unsigned long long)native_sectors,
(unsigned long long)sectors);
return 0;
}
/* let's unlock HPA */
rc = ata_set_max_sectors(dev, native_sectors);
if (rc == -EACCES) {
/* if device aborted the command, skip HPA resizing */
ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
"(%llu -> %llu), skipping HPA handling\n",
(unsigned long long)sectors,
(unsigned long long)native_sectors);
dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
return 0;
} else if (rc)
return rc;
/* re-read IDENTIFY data */
rc = ata_dev_reread_id(dev, 0);
if (rc) {
ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
"data after HPA resizing\n");
return rc;
}
if (print_info) {
u64 new_sectors = ata_id_n_sectors(dev->id);
ata_dev_printk(dev, KERN_INFO,
"HPA unlocked: %llu -> %llu, native %llu\n",
(unsigned long long)sectors,
(unsigned long long)new_sectors,
(unsigned long long)native_sectors);
}
return 0;
}
/**
* ata_noop_dev_select - Select device 0/1 on ATA bus
* @ap: ATA channel to manipulate
* @device: ATA device (numbered from zero) to select
*
* This function performs no actual function.
*
* May be used as the dev_select() entry in ata_port_operations.
*
* LOCKING:
* caller.
*/
void ata_noop_dev_select(struct ata_port *ap, unsigned int device)
{
}
/**
* ata_std_dev_select - Select device 0/1 on ATA bus
* @ap: ATA channel to manipulate
* @device: ATA device (numbered from zero) to select
*
* Use the method defined in the ATA specification to
* make either device 0, or device 1, active on the
* ATA channel. Works with both PIO and MMIO.
*
* May be used as the dev_select() entry in ata_port_operations.
*
* LOCKING:
* caller.
*/
void ata_std_dev_select(struct ata_port *ap, unsigned int device)
{
u8 tmp;
if (device == 0)
tmp = ATA_DEVICE_OBS;
else
tmp = ATA_DEVICE_OBS | ATA_DEV1;
iowrite8(tmp, ap->ioaddr.device_addr);
ata_pause(ap); /* needed; also flushes, for mmio */
}
/**
* ata_dev_select - Select device 0/1 on ATA bus
* @ap: ATA channel to manipulate
* @device: ATA device (numbered from zero) to select
* @wait: non-zero to wait for Status register BSY bit to clear
* @can_sleep: non-zero if context allows sleeping
*
* Use the method defined in the ATA specification to
* make either device 0, or device 1, active on the
* ATA channel.
*
* This is a high-level version of ata_std_dev_select(),
* which additionally provides the services of inserting
* the proper pauses and status polling, where needed.
*
* LOCKING:
* caller.
*/
void ata_dev_select(struct ata_port *ap, unsigned int device,
unsigned int wait, unsigned int can_sleep)
{
if (ata_msg_probe(ap))
ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
"device %u, wait %u\n", device, wait);
if (wait)
ata_wait_idle(ap);
ap->ops->dev_select(ap, device);
if (wait) {
if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
msleep(150);
ata_wait_idle(ap);
}
}
/**
* ata_dump_id - IDENTIFY DEVICE info debugging output
* @id: IDENTIFY DEVICE page to dump
*
* Dump selected 16-bit words from the given IDENTIFY DEVICE
* page.
*
* LOCKING:
* caller.
*/
static inline void ata_dump_id(const u16 *id)
{
DPRINTK("49==0x%04x "
"53==0x%04x "
"63==0x%04x "
"64==0x%04x "
"75==0x%04x \n",
id[49],
id[53],
id[63],
id[64],
id[75]);
DPRINTK("80==0x%04x "
"81==0x%04x "
"82==0x%04x "
"83==0x%04x "
"84==0x%04x \n",
id[80],
id[81],
id[82],
id[83],
id[84]);
DPRINTK("88==0x%04x "
"93==0x%04x\n",
id[88],
id[93]);
}
/**
* ata_id_xfermask - Compute xfermask from the given IDENTIFY data
* @id: IDENTIFY data to compute xfer mask from
*
* Compute the xfermask for this device. This is not as trivial
* as it seems if we must consider early devices correctly.
*
* FIXME: pre IDE drive timing (do we care ?).
*
* LOCKING:
* None.
*
* RETURNS:
* Computed xfermask
*/
unsigned long ata_id_xfermask(const u16 *id)
{
unsigned long pio_mask, mwdma_mask, udma_mask;
/* Usual case. Word 53 indicates word 64 is valid */
if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
pio_mask <<= 3;
pio_mask |= 0x7;
} else {
/* If word 64 isn't valid then Word 51 high byte holds
* the PIO timing number for the maximum. Turn it into
* a mask.
*/
u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
if (mode < 5) /* Valid PIO range */
pio_mask = (2 << mode) - 1;
else
pio_mask = 1;
/* But wait.. there's more. Design your standards by
* committee and you too can get a free iordy field to
* process. However its the speeds not the modes that
* are supported... Note drivers using the timing API
* will get this right anyway
*/
}
mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
if (ata_id_is_cfa(id)) {
/*
* Process compact flash extended modes
*/
int pio = id[163] & 0x7;
int dma = (id[163] >> 3) & 7;
if (pio)
pio_mask |= (1 << 5);
if (pio > 1)
pio_mask |= (1 << 6);
if (dma)
mwdma_mask |= (1 << 3);
if (dma > 1)
mwdma_mask |= (1 << 4);
}
udma_mask = 0;
if (id[ATA_ID_FIELD_VALID] & (1 << 2))
udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}
/**
* ata_pio_queue_task - Queue port_task
* @ap: The ata_port to queue port_task for
* @fn: workqueue function to be scheduled
* @data: data for @fn to use
* @delay: delay time for workqueue function
*
* Schedule @fn(@data) for execution after @delay jiffies using
* port_task. There is one port_task per port and it's the
* user(low level driver)'s responsibility to make sure that only
* one task is active at any given time.
*
* libata core layer takes care of synchronization between
* port_task and EH. ata_pio_queue_task() may be ignored for EH
* synchronization.
*
* LOCKING:
* Inherited from caller.
*/
static void ata_pio_queue_task(struct ata_port *ap, void *data,
unsigned long delay)
{
ap->port_task_data = data;
/* may fail if ata_port_flush_task() in progress */
queue_delayed_work(ata_wq, &ap->port_task, delay);
}
/**
* ata_port_flush_task - Flush port_task
* @ap: The ata_port to flush port_task for
*
* After this function completes, port_task is guranteed not to
* be running or scheduled.
*
* LOCKING:
* Kernel thread context (may sleep)
*/
void ata_port_flush_task(struct ata_port *ap)
{
DPRINTK("ENTER\n");
cancel_rearming_delayed_work(&ap->port_task);
if (ata_msg_ctl(ap))
ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
}
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
{
struct completion *waiting = qc->private_data;
complete(waiting);
}
/**
* ata_exec_internal_sg - execute libata internal command
* @dev: Device to which the command is sent
* @tf: Taskfile registers for the command and the result
* @cdb: CDB for packet command
* @dma_dir: Data tranfer direction of the command
* @sgl: sg list for the data buffer of the command
* @n_elem: Number of sg entries
* @timeout: Timeout in msecs (0 for default)
*
* Executes libata internal command with timeout. @tf contains
* command on entry and result on return. Timeout and error
* conditions are reported via return value. No recovery action
* is taken after a command times out. It's caller's duty to
* clean up after timeout.
*
* LOCKING:
* None. Should be called with kernel context, might sleep.
*
* RETURNS:
* Zero on success, AC_ERR_* mask on failure
*/
unsigned ata_exec_internal_sg(struct ata_device *dev,
struct ata_taskfile *tf, const u8 *cdb,
int dma_dir, struct scatterlist *sgl,
unsigned int n_elem, unsigned long timeout)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
u8 command = tf->command;
struct ata_queued_cmd *qc;
unsigned int tag, preempted_tag;
u32 preempted_sactive, preempted_qc_active;
int preempted_nr_active_links;
DECLARE_COMPLETION_ONSTACK(wait);
unsigned long flags;
unsigned int err_mask;
int rc;
spin_lock_irqsave(ap->lock, flags);
/* no internal command while frozen */
if (ap->pflags & ATA_PFLAG_FROZEN) {
spin_unlock_irqrestore(ap->lock, flags);
return AC_ERR_SYSTEM;
}
/* initialize internal qc */
/* XXX: Tag 0 is used for drivers with legacy EH as some
* drivers choke if any other tag is given. This breaks
* ata_tag_internal() test for those drivers. Don't use new
* EH stuff without converting to it.
*/
if (ap->ops->error_handler)
tag = ATA_TAG_INTERNAL;
else
tag = 0;
if (test_and_set_bit(tag, &ap->qc_allocated))
BUG();
qc = __ata_qc_from_tag(ap, tag);
qc->tag = tag;
qc->scsicmd = NULL;
qc->ap = ap;
qc->dev = dev;
ata_qc_reinit(qc);
preempted_tag = link->active_tag;
preempted_sactive = link->sactive;
preempted_qc_active = ap->qc_active;
preempted_nr_active_links = ap->nr_active_links;
link->active_tag = ATA_TAG_POISON;
link->sactive = 0;
ap->qc_active = 0;
ap->nr_active_links = 0;
/* prepare & issue qc */
qc->tf = *tf;
if (cdb)
memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
qc->flags |= ATA_QCFLAG_RESULT_TF;
qc->dma_dir = dma_dir;
if (dma_dir != DMA_NONE) {
unsigned int i, buflen = 0;
struct scatterlist *sg;
for_each_sg(sgl, sg, n_elem, i)
buflen += sg->length;
ata_sg_init(qc, sgl, n_elem);
qc->nbytes = buflen;
}
qc->private_data = &wait;
qc->complete_fn = ata_qc_complete_internal;
ata_qc_issue(qc);
spin_unlock_irqrestore(ap->lock, flags);
if (!timeout)
timeout = ata_probe_timeout * 1000 / HZ;
rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
ata_port_flush_task(ap);
if (!rc) {
spin_lock_irqsave(ap->lock, flags);
/* We're racing with irq here. If we lose, the
* following test prevents us from completing the qc
* twice. If we win, the port is frozen and will be
* cleaned up by ->post_internal_cmd().
*/
if (qc->flags & ATA_QCFLAG_ACTIVE) {
qc->err_mask |= AC_ERR_TIMEOUT;
if (ap->ops->error_handler)
ata_port_freeze(ap);
else
ata_qc_complete(qc);
if (ata_msg_warn(ap))
ata_dev_printk(dev, KERN_WARNING,
"qc timeout (cmd 0x%x)\n", command);
}
spin_unlock_irqrestore(ap->lock, flags);
}
/* do post_internal_cmd */
if (ap->ops->post_internal_cmd)
ap->ops->post_internal_cmd(qc);
/* perform minimal error analysis */
if (qc->flags & ATA_QCFLAG_FAILED) {
if (qc->result_tf.command & (ATA_ERR | ATA_DF))
qc->err_mask |= AC_ERR_DEV;
if (!qc->err_mask)
qc->err_mask |= AC_ERR_OTHER;
if (qc->err_mask & ~AC_ERR_OTHER)
qc->err_mask &= ~AC_ERR_OTHER;
}
/* finish up */
spin_lock_irqsave(ap->lock, flags);
*tf = qc->result_tf;
err_mask = qc->err_mask;
ata_qc_free(qc);
link->active_tag = preempted_tag;
link->sactive = preempted_sactive;
ap->qc_active = preempted_qc_active;
ap->nr_active_links = preempted_nr_active_links;
/* XXX - Some LLDDs (sata_mv) disable port on command failure.
* Until those drivers are fixed, we detect the condition
* here, fail the command with AC_ERR_SYSTEM and reenable the
* port.
*
* Note that this doesn't change any behavior as internal
* command failure results in disabling the device in the
* higher layer for LLDDs without new reset/EH callbacks.
*
* Kill the following code as soon as those drivers are fixed.
*/
if (ap->flags & ATA_FLAG_DISABLED) {
err_mask |= AC_ERR_SYSTEM;
ata_port_probe(ap);
}
spin_unlock_irqrestore(ap->lock, flags);
return err_mask;
}
/**
* ata_exec_internal - execute libata internal command
* @dev: Device to which the command is sent
* @tf: Taskfile registers for the command and the result
* @cdb: CDB for packet command
* @dma_dir: Data tranfer direction of the command
* @buf: Data buffer of the command
* @buflen: Length of data buffer
* @timeout: Timeout in msecs (0 for default)
*
* Wrapper around ata_exec_internal_sg() which takes simple
* buffer instead of sg list.
*
* LOCKING:
* None. Should be called with kernel context, might sleep.
*
* RETURNS:
* Zero on success, AC_ERR_* mask on failure
*/
unsigned ata_exec_internal(struct ata_device *dev,
struct ata_taskfile *tf, const u8 *cdb,
int dma_dir, void *buf, unsigned int buflen,
unsigned long timeout)
{
struct scatterlist *psg = NULL, sg;
unsigned int n_elem = 0;
if (dma_dir != DMA_NONE) {
WARN_ON(!buf);
sg_init_one(&sg, buf, buflen);
psg = &sg;
n_elem++;
}
return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
timeout);
}
/**
* ata_do_simple_cmd - execute simple internal command
* @dev: Device to which the command is sent
* @cmd: Opcode to execute
*
* Execute a 'simple' command, that only consists of the opcode
* 'cmd' itself, without filling any other registers
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* Zero on success, AC_ERR_* mask on failure
*/
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
{
struct ata_taskfile tf;
ata_tf_init(dev, &tf);
tf.command = cmd;
tf.flags |= ATA_TFLAG_DEVICE;
tf.protocol = ATA_PROT_NODATA;
return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
}
/**
* ata_pio_need_iordy - check if iordy needed
* @adev: ATA device
*
* Check if the current speed of the device requires IORDY. Used
* by various controllers for chip configuration.
*/
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
/* Controller doesn't support IORDY. Probably a pointless check
as the caller should know this */
if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
return 0;
/* PIO3 and higher it is mandatory */
if (adev->pio_mode > XFER_PIO_2)
return 1;
/* We turn it on when possible */
if (ata_id_has_iordy(adev->id))
return 1;
return 0;
}
/**
* ata_pio_mask_no_iordy - Return the non IORDY mask
* @adev: ATA device
*
* Compute the highest mode possible if we are not using iordy. Return
* -1 if no iordy mode is available.
*/
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
/* If we have no drive specific rule, then PIO 2 is non IORDY */
if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
u16 pio = adev->id[ATA_ID_EIDE_PIO];
/* Is the speed faster than the drive allows non IORDY ? */
if (pio) {
/* This is cycle times not frequency - watch the logic! */
if (pio > 240) /* PIO2 is 240nS per cycle */
return 3 << ATA_SHIFT_PIO;
return 7 << ATA_SHIFT_PIO;
}
}
return 3 << ATA_SHIFT_PIO;
}
/**
* ata_dev_read_id - Read ID data from the specified device
* @dev: target device
* @p_class: pointer to class of the target device (may be changed)
* @flags: ATA_READID_* flags
* @id: buffer to read IDENTIFY data into
*
* Read ID data from the specified device. ATA_CMD_ID_ATA is
* performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
* devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
* for pre-ATA4 drives.
*
* FIXME: ATA_CMD_ID_ATA is optional for early drives and right
* now we abort if we hit that case.
*
* LOCKING:
* Kernel thread context (may sleep)
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
unsigned int flags, u16 *id)
{
struct ata_port *ap = dev->link->ap;
unsigned int class = *p_class;
struct ata_taskfile tf;
unsigned int err_mask = 0;
const char *reason;
int may_fallback = 1, tried_spinup = 0;
int rc;
if (ata_msg_ctl(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
retry:
ata_tf_init(dev, &tf);
switch (class) {
case ATA_DEV_ATA:
tf.command = ATA_CMD_ID_ATA;
break;
case ATA_DEV_ATAPI:
tf.command = ATA_CMD_ID_ATAPI;
break;
default:
rc = -ENODEV;
reason = "unsupported class";
goto err_out;
}
tf.protocol = ATA_PROT_PIO;
/* Some devices choke if TF registers contain garbage. Make
* sure those are properly initialized.
*/
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
/* Device presence detection is unreliable on some
* controllers. Always poll IDENTIFY if available.
*/
tf.flags |= ATA_TFLAG_POLLING;
err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
id, sizeof(id[0]) * ATA_ID_WORDS, 0);
if (err_mask) {
if (err_mask & AC_ERR_NODEV_HINT) {
ata_dev_printk(dev, KERN_DEBUG,
"NODEV after polling detection\n");
return -ENOENT;
}
if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
/* Device or controller might have reported
* the wrong device class. Give a shot at the
* other IDENTIFY if the current one is
* aborted by the device.
*/
if (may_fallback) {
may_fallback = 0;
if (class == ATA_DEV_ATA)
class = ATA_DEV_ATAPI;
else
class = ATA_DEV_ATA;
goto retry;
}
/* Control reaches here iff the device aborted
* both flavors of IDENTIFYs which happens
* sometimes with phantom devices.
*/
ata_dev_printk(dev, KERN_DEBUG,
"both IDENTIFYs aborted, assuming NODEV\n");
return -ENOENT;
}
rc = -EIO;
reason = "I/O error";
goto err_out;
}
/* Falling back doesn't make sense if ID data was read
* successfully at least once.
*/
may_fallback = 0;
swap_buf_le16(id, ATA_ID_WORDS);
/* sanity check */
rc = -EINVAL;
reason = "device reports invalid type";
if (class == ATA_DEV_ATA) {
if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
goto err_out;
} else {
if (ata_id_is_ata(id))
goto err_out;
}
if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
tried_spinup = 1;
/*
* Drive powered-up in standby mode, and requires a specific
* SET_FEATURES spin-up subcommand before it will accept
* anything other than the original IDENTIFY command.
*/
err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
if (err_mask && id[2] != 0x738c) {
rc = -EIO;
reason = "SPINUP failed";
goto err_out;
}
/*
* If the drive initially returned incomplete IDENTIFY info,
* we now must reissue the IDENTIFY command.
*/
if (id[2] == 0x37c8)
goto retry;
}
if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
/*
* The exact sequence expected by certain pre-ATA4 drives is:
* SRST RESET
* IDENTIFY (optional in early ATA)
* INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
* anything else..
* Some drives were very specific about that exact sequence.
*
* Note that ATA4 says lba is mandatory so the second check
* shoud never trigger.
*/
if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
err_mask = ata_dev_init_params(dev, id[3], id[6]);
if (err_mask) {
rc = -EIO;
reason = "INIT_DEV_PARAMS failed";
goto err_out;
}
/* current CHS translation info (id[53-58]) might be
* changed. reread the identify device info.
*/
flags &= ~ATA_READID_POSTRESET;
goto retry;
}
}
*p_class = class;
return 0;
err_out:
if (ata_msg_warn(ap))
ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
"(%s, err_mask=0x%x)\n", reason, err_mask);
return rc;
}
static inline u8 ata_dev_knobble(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
}
static void ata_dev_config_ncq(struct ata_device *dev,
char *desc, size_t desc_sz)
{
struct ata_port *ap = dev->link->ap;
int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
if (!ata_id_has_ncq(dev->id)) {
desc[0] = '\0';
return;
}
if (dev->horkage & ATA_HORKAGE_NONCQ) {
snprintf(desc, desc_sz, "NCQ (not used)");
return;
}
if (ap->flags & ATA_FLAG_NCQ) {
hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
dev->flags |= ATA_DFLAG_NCQ;
}
if (hdepth >= ddepth)
snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
else
snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
}
/**
* ata_dev_configure - Configure the specified ATA/ATAPI device
* @dev: Target device to configure
*
* Configure @dev according to @dev->id. Generic and low-level
* driver specific fixups are also applied.
*
* LOCKING:
* Kernel thread context (may sleep)
*
* RETURNS:
* 0 on success, -errno otherwise
*/
int ata_dev_configure(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
struct ata_eh_context *ehc = &dev->link->eh_context;
int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
const u16 *id = dev->id;
unsigned long xfer_mask;
char revbuf[7]; /* XYZ-99\0 */
char fwrevbuf[ATA_ID_FW_REV_LEN+1];
char modelbuf[ATA_ID_PROD_LEN+1];
int rc;
if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
__func__);
return 0;
}
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
/* set horkage */
dev->horkage |= ata_dev_blacklisted(dev);
ata_force_horkage(dev);
/* let ACPI work its magic */
rc = ata_acpi_on_devcfg(dev);
if (rc)
return rc;
/* massage HPA, do it early as it might change IDENTIFY data */
rc = ata_hpa_resize(dev);
if (rc)
return rc;
/* print device capabilities */
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG,
"%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
"85:%04x 86:%04x 87:%04x 88:%04x\n",
__func__,
id[49], id[82], id[83], id[84],
id[85], id[86], id[87], id[88]);
/* initialize to-be-configured parameters */
dev->flags &= ~ATA_DFLAG_CFG_MASK;
dev->max_sectors = 0;
dev->cdb_len = 0;
dev->n_sectors = 0;
dev->cylinders = 0;
dev->heads = 0;
dev->sectors = 0;
/*
* common ATA, ATAPI feature tests
*/
/* find max transfer mode; for printk only */
xfer_mask = ata_id_xfermask(id);
if (ata_msg_probe(ap))
ata_dump_id(id);
/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
sizeof(fwrevbuf));
ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
sizeof(modelbuf));
/* ATA-specific feature tests */
if (dev->class == ATA_DEV_ATA) {
if (ata_id_is_cfa(id)) {
if (id[162] & 1) /* CPRM may make this media unusable */
ata_dev_printk(dev, KERN_WARNING,
"supports DRM functions and may "
"not be fully accessable.\n");
snprintf(revbuf, 7, "CFA");
} else {
snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
/* Warn the user if the device has TPM extensions */
if (ata_id_has_tpm(id))
ata_dev_printk(dev, KERN_WARNING,
"supports DRM functions and may "
"not be fully accessable.\n");
}
dev->n_sectors = ata_id_n_sectors(id);
if (dev->id[59] & 0x100)
dev->multi_count = dev->id[59] & 0xff;
if (ata_id_has_lba(id)) {
const char *lba_desc;
char ncq_desc[20];
lba_desc = "LBA";
dev->flags |= ATA_DFLAG_LBA;
if (ata_id_has_lba48(id)) {
dev->flags |= ATA_DFLAG_LBA48;
lba_desc = "LBA48";
if (dev->n_sectors >= (1UL << 28) &&
ata_id_has_flush_ext(id))
dev->flags |= ATA_DFLAG_FLUSH_EXT;
}
/* config NCQ */
ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
/* print device info to dmesg */
if (ata_msg_drv(ap) && print_info) {
ata_dev_printk(dev, KERN_INFO,
"%s: %s, %s, max %s\n",
revbuf, modelbuf, fwrevbuf,
ata_mode_string(xfer_mask));
ata_dev_printk(dev, KERN_INFO,
"%Lu sectors, multi %u: %s %s\n",
(unsigned long long)dev->n_sectors,
dev->multi_count, lba_desc, ncq_desc);
}
} else {
/* CHS */
/* Default translation */
dev->cylinders = id[1];
dev->heads = id[3];
dev->sectors = id[6];
if (ata_id_current_chs_valid(id)) {
/* Current CHS translation is valid. */
dev->cylinders = id[54];
dev->heads = id[55];
dev->sectors = id[56];
}
/* print device info to dmesg */
if (ata_msg_drv(ap) && print_info) {
ata_dev_printk(dev, KERN_INFO,
"%s: %s, %s, max %s\n",
revbuf, modelbuf, fwrevbuf,
ata_mode_string(xfer_mask));
ata_dev_printk(dev, KERN_INFO,
"%Lu sectors, multi %u, CHS %u/%u/%u\n",
(unsigned long long)dev->n_sectors,
dev->multi_count, dev->cylinders,
dev->heads, dev->sectors);
}
}
dev->cdb_len = 16;
}
/* ATAPI-specific feature tests */
else if (dev->class == ATA_DEV_ATAPI) {
const char *cdb_intr_string = "";
const char *atapi_an_string = "";
const char *dma_dir_string = "";
u32 sntf;
rc = atapi_cdb_len(id);
if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
if (ata_msg_warn(ap))
ata_dev_printk(dev, KERN_WARNING,
"unsupported CDB len\n");
rc = -EINVAL;
goto err_out_nosup;
}
dev->cdb_len = (unsigned int) rc;
/* Enable ATAPI AN if both the host and device have
* the support. If PMP is attached, SNTF is required
* to enable ATAPI AN to discern between PHY status
* changed notifications and ATAPI ANs.
*/
if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
(!ap->nr_pmp_links ||
sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
unsigned int err_mask;
/* issue SET feature command to turn this on */
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_ENABLE, SATA_AN);
if (err_mask)
ata_dev_printk(dev, KERN_ERR,
"failed to enable ATAPI AN "
"(err_mask=0x%x)\n", err_mask);
else {
dev->flags |= ATA_DFLAG_AN;
atapi_an_string = ", ATAPI AN";
}
}
if (ata_id_cdb_intr(dev->id)) {
dev->flags |= ATA_DFLAG_CDB_INTR;
cdb_intr_string = ", CDB intr";
}
if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
dev->flags |= ATA_DFLAG_DMADIR;
dma_dir_string = ", DMADIR";
}
/* print device info to dmesg */
if (ata_msg_drv(ap) && print_info)
ata_dev_printk(dev, KERN_INFO,
"ATAPI: %s, %s, max %s%s%s%s\n",
modelbuf, fwrevbuf,
ata_mode_string(xfer_mask),
cdb_intr_string, atapi_an_string,
dma_dir_string);
}
/* determine max_sectors */
dev->max_sectors = ATA_MAX_SECTORS;
if (dev->flags & ATA_DFLAG_LBA48)
dev->max_sectors = ATA_MAX_SECTORS_LBA48;
if (!(dev->horkage & ATA_HORKAGE_IPM)) {
if (ata_id_has_hipm(dev->id))
dev->flags |= ATA_DFLAG_HIPM;
if (ata_id_has_dipm(dev->id))
dev->flags |= ATA_DFLAG_DIPM;
}
/* Limit PATA drive on SATA cable bridge transfers to udma5,
200 sectors */
if (ata_dev_knobble(dev)) {
if (ata_msg_drv(ap) && print_info)
ata_dev_printk(dev, KERN_INFO,
"applying bridge limits\n");
dev->udma_mask &= ATA_UDMA5;
dev->max_sectors = ATA_MAX_SECTORS;
}
if ((dev->class == ATA_DEV_ATAPI) &&
(atapi_command_packet_set(id) == TYPE_TAPE)) {
dev->max_sectors = ATA_MAX_SECTORS_TAPE;
dev->horkage |= ATA_HORKAGE_STUCK_ERR;
}
if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
dev->max_sectors);
if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
dev->horkage |= ATA_HORKAGE_IPM;
/* reset link pm_policy for this port to no pm */
ap->pm_policy = MAX_PERFORMANCE;
}
if (ap->ops->dev_config)
ap->ops->dev_config(dev);
if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
/* Let the user know. We don't want to disallow opens for
rescue purposes, or in case the vendor is just a blithering
idiot. Do this after the dev_config call as some controllers
with buggy firmware may want to avoid reporting false device
bugs */
if (print_info) {
ata_dev_printk(dev, KERN_WARNING,
"Drive reports diagnostics failure. This may indicate a drive\n");
ata_dev_printk(dev, KERN_WARNING,
"fault or invalid emulation. Contact drive vendor for information.\n");
}
}
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
__func__, ata_chk_status(ap));
return 0;
err_out_nosup:
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG,
"%s: EXIT, err\n", __func__);
return rc;
}
/**
* ata_cable_40wire - return 40 wire cable type
* @ap: port
*
* Helper method for drivers which want to hardwire 40 wire cable
* detection.
*/
int ata_cable_40wire(struct ata_port *ap)
{
return ATA_CBL_PATA40;
}
/**
* ata_cable_80wire - return 80 wire cable type
* @ap: port
*
* Helper method for drivers which want to hardwire 80 wire cable
* detection.
*/
int ata_cable_80wire(struct ata_port *ap)
{
return ATA_CBL_PATA80;
}
/**
* ata_cable_unknown - return unknown PATA cable.
* @ap: port
*
* Helper method for drivers which have no PATA cable detection.
*/
int ata_cable_unknown(struct ata_port *ap)
{
return ATA_CBL_PATA_UNK;
}
/**
* ata_cable_ignore - return ignored PATA cable.
* @ap: port
*
* Helper method for drivers which don't use cable type to limit
* transfer mode.
*/
int ata_cable_ignore(struct ata_port *ap)
{
return ATA_CBL_PATA_IGN;
}
/**
* ata_cable_sata - return SATA cable type
* @ap: port
*
* Helper method for drivers which have SATA cables
*/
int ata_cable_sata(struct ata_port *ap)
{
return ATA_CBL_SATA;
}
/**
* ata_bus_probe - Reset and probe ATA bus
* @ap: Bus to probe
*
* Master ATA bus probing function. Initiates a hardware-dependent
* bus reset, then attempts to identify any devices found on
* the bus.
*
* LOCKING:
* PCI/etc. bus probe sem.
*
* RETURNS:
* Zero on success, negative errno otherwise.
*/
int ata_bus_probe(struct ata_port *ap)
{
unsigned int classes[ATA_MAX_DEVICES];
int tries[ATA_MAX_DEVICES];
int rc;
struct ata_device *dev;
ata_port_probe(ap);
ata_link_for_each_dev(dev, &ap->link)
tries[dev->devno] = ATA_PROBE_MAX_TRIES;
retry:
ata_link_for_each_dev(dev, &ap->link) {
/* If we issue an SRST then an ATA drive (not ATAPI)
* may change configuration and be in PIO0 timing. If
* we do a hard reset (or are coming from power on)
* this is true for ATA or ATAPI. Until we've set a
* suitable controller mode we should not touch the
* bus as we may be talking too fast.
*/
dev->pio_mode = XFER_PIO_0;
/* If the controller has a pio mode setup function
* then use it to set the chipset to rights. Don't
* touch the DMA setup as that will be dealt with when
* configuring devices.
*/
if (ap->ops->set_piomode)
ap->ops->set_piomode(ap, dev);
}
/* reset and determine device classes */
ap->ops->phy_reset(ap);
ata_link_for_each_dev(dev, &ap->link) {
if (!(ap->flags & ATA_FLAG_DISABLED) &&
dev->class != ATA_DEV_UNKNOWN)
classes[dev->devno] = dev->class;
else
classes[dev->devno] = ATA_DEV_NONE;
dev->class = ATA_DEV_UNKNOWN;
}
ata_port_probe(ap);
/* read IDENTIFY page and configure devices. We have to do the identify
specific sequence bass-ackwards so that PDIAG- is released by
the slave device */
ata_link_for_each_dev(dev, &ap->link) {
if (tries[dev->devno])
dev->class = classes[dev->devno];
if (!ata_dev_enabled(dev))
continue;
rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
dev->id);
if (rc)
goto fail;
}
/* Now ask for the cable type as PDIAG- should have been released */
if (ap->ops->cable_detect)
ap->cbl = ap->ops->cable_detect(ap);
/* We may have SATA bridge glue hiding here irrespective of the
reported cable types and sensed types */
ata_link_for_each_dev(dev, &ap->link) {
if (!ata_dev_enabled(dev))
continue;
/* SATA drives indicate we have a bridge. We don't know which
end of the link the bridge is which is a problem */
if (ata_id_is_sata(dev->id))
ap->cbl = ATA_CBL_SATA;
}
/* After the identify sequence we can now set up the devices. We do
this in the normal order so that the user doesn't get confused */
ata_link_for_each_dev(dev, &ap->link) {
if (!ata_dev_enabled(dev))
continue;
ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
rc = ata_dev_configure(dev);
ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
if (rc)
goto fail;
}
/* configure transfer mode */
rc = ata_set_mode(&ap->link, &dev);
if (rc)
goto fail;
ata_link_for_each_dev(dev, &ap->link)
if (ata_dev_enabled(dev))
return 0;
/* no device present, disable port */
ata_port_disable(ap);
return -ENODEV;
fail:
tries[dev->devno]--;
switch (rc) {
case -EINVAL:
/* eeek, something went very wrong, give up */
tries[dev->devno] = 0;
break;
case -ENODEV:
/* give it just one more chance */
tries[dev->devno] = min(tries[dev->devno], 1);
case -EIO:
if (tries[dev->devno] == 1) {
/* This is the last chance, better to slow
* down than lose it.
*/
sata_down_spd_limit(&ap->link);
ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
}
}
if (!tries[dev->devno])
ata_dev_disable(dev);
goto retry;
}
/**
* ata_port_probe - Mark port as enabled
* @ap: Port for which we indicate enablement
*
* Modify @ap data structure such that the system
* thinks that the entire port is enabled.
*
* LOCKING: host lock, or some other form of
* serialization.
*/
void ata_port_probe(struct ata_port *ap)
{
ap->flags &= ~ATA_FLAG_DISABLED;
}
/**
* sata_print_link_status - Print SATA link status
* @link: SATA link to printk link status about
*
* This function prints link speed and status of a SATA link.
*
* LOCKING:
* None.
*/
void sata_print_link_status(struct ata_link *link)
{
u32 sstatus, scontrol, tmp;
if (sata_scr_read(link, SCR_STATUS, &sstatus))
return;
sata_scr_read(link, SCR_CONTROL, &scontrol);
if (ata_link_online(link)) {
tmp = (sstatus >> 4) & 0xf;
ata_link_printk(link, KERN_INFO,
"SATA link up %s (SStatus %X SControl %X)\n",
sata_spd_string(tmp), sstatus, scontrol);
} else {
ata_link_printk(link, KERN_INFO,
"SATA link down (SStatus %X SControl %X)\n",
sstatus, scontrol);
}
}
/**
* ata_dev_pair - return other device on cable
* @adev: device
*
* Obtain the other device on the same cable, or if none is
* present NULL is returned
*/
struct ata_device *ata_dev_pair(struct ata_device *adev)
{
struct ata_link *link = adev->link;
struct ata_device *pair = &link->device[1 - adev->devno];
if (!ata_dev_enabled(pair))
return NULL;
return pair;
}
/**
* ata_port_disable - Disable port.
* @ap: Port to be disabled.
*
* Modify @ap data structure such that the system
* thinks that the entire port is disabled, and should
* never attempt to probe or communicate with devices
* on this port.
*
* LOCKING: host lock, or some other form of
* serialization.
*/
void ata_port_disable(struct ata_port *ap)
{
ap->link.device[0].class = ATA_DEV_NONE;
ap->link.device[1].class = ATA_DEV_NONE;
ap->flags |= ATA_FLAG_DISABLED;
}
/**
* sata_down_spd_limit - adjust SATA spd limit downward
* @link: Link to adjust SATA spd limit for
*
* Adjust SATA spd limit of @link downward. Note that this
* function only adjusts the limit. The change must be applied
* using sata_set_spd().
*
* LOCKING:
* Inherited from caller.
*
* RETURNS:
* 0 on success, negative errno on failure
*/
int sata_down_spd_limit(struct ata_link *link)
{
u32 sstatus, spd, mask;
int rc, highbit;
if (!sata_scr_valid(link))
return -EOPNOTSUPP;
/* If SCR can be read, use it to determine the current SPD.
* If not, use cached value in link->sata_spd.
*/
rc = sata_scr_read(link, SCR_STATUS, &sstatus);
if (rc == 0)
spd = (sstatus >> 4) & 0xf;
else
spd = link->sata_spd;
mask = link->sata_spd_limit;
if (mask <= 1)
return -EINVAL;
/* unconditionally mask off the highest bit */
highbit = fls(mask) - 1;
mask &= ~(1 << highbit);
/* Mask off all speeds higher than or equal to the current
* one. Force 1.5Gbps if current SPD is not available.
*/
if (spd > 1)
mask &= (1 << (spd - 1)) - 1;
else
mask &= 1;
/* were we already at the bottom? */
if (!mask)
return -EINVAL;
link->sata_spd_limit = mask;
ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
sata_spd_string(fls(mask)));
return 0;
}
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
{
struct ata_link *host_link = &link->ap->link;
u32 limit, target, spd;
limit = link->sata_spd_limit;
/* Don't configure downstream link faster than upstream link.
* It doesn't speed up anything and some PMPs choke on such
* configuration.
*/
if (!ata_is_host_link(link) && host_link->sata_spd)
limit &= (1 << host_link->sata_spd) - 1;
if (limit == UINT_MAX)
target = 0;
else
target = fls(limit);
spd = (*scontrol >> 4) & 0xf;
*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
return spd != target;